I have a 94 Cadillac Fleetwood! The Headlights work when the sun goes down like normal! The Timer Switch works like normal! The Dimmer Switch works like normal! You turn it all the way ad the Interior Lights work like normal! BUT... When you pull the knob to turn the Headlight on manually the Headlights want work? But the Taillights come on like normal!

Does anyone know if it might just be the switch???

What are somethings I can check and where are they to check them? Everything works but Head Light! But the Head Lights work when the sensor is turned on???